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#1
Hey mate, :)
It's a notification letting you know that the drive you selected to save File History to has been disconnected for too long when attempting to create backups, and wants you to either verify if this is still a valid location or select a different drive.
Select Drive for File History in Windows 10 | Windows 10 Tutorials
If you don't use File History, then you can turn off File History to stop this.
Turn On or Off File History in Windows 10 | Windows 10 Tutorials